Cita APA (7a ed.)

Thornbury, W. (1969). Principles of geomorphology (2nd edition.). John Wiley.

Cita Chicago Style (17a ed.)

Thornbury, W. Principles of Geomorphology. 2nd edition. Tokyo: John Wiley, 1969.

Cita MLA (8a ed.)

Thornbury, W. Principles of Geomorphology. 2nd edition. John Wiley, 1969.